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#! /usr/bin/env python3
# Sample script to convert legacy cmap subtables to format-4
# subtables. Note that this is rarely what one needs. You
# probably need to just drop the legacy subtables if the font
# already has a format-4 subtable.
#
# Other times, you would need to convert a non-Unicode cmap
# legacy subtable to a Unicode one. In those cases, use the
# getEncoding() of subtable and use that encoding to map the
# characters to Unicode... TODO: Extend this script to do that.
from fontTools.ttLib import TTFont
from fontTools.ttLib.tables._c_m_a_p import CmapSubtable
import sys
if len(sys.argv) != 3:
print("usage: cmap-format.py fontfile.ttf outfile.ttf")
sys.exit(1)
fontfile = sys.argv[1]
outfile = sys.argv[2]
font = TTFont(fontfile)
cmap = font["cmap"]
outtables = []
for table in cmap.tables:
if table.format in [4, 12, 13, 14]:
outtables.append(table)
# Convert ot format4
newtable = CmapSubtable.newSubtable(4)
newtable.platformID = table.platformID
newtable.platEncID = table.platEncID
newtable.language = table.language
newtable.cmap = table.cmap
outtables.append(newtable)
cmap.tables = outtables
font.save(outfile)
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